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The numbers you need are flow rates and desired temperatures. For example, Home Depot's guide gives the following flow rates: Bathroom Faucet: 0.5 – 1.5 gpm Low Flow Kitchen Faucet: 3.0 – 7.0 gpm Shower: 1.0 – 2.0 gpm Dishwasher: 1.0 – 2.5 gpm Clothes Washer: 1.5 – 3.0 gpm Tankless heaters are rated for how much heat they provide at a given flow. If ...


6

With a tankless water heater it's all about how many degrees the heater can raise a certain quantity of water. In your situation, you will need a heater to raise the temperature of about 5 gallons per minute (two showers running at once or one shower and another hot water tap running). If you live in the north, and the water out of the tap is be 40 degrees ...


1

You're adding more points of failure, and when the small tank runs out, you will see a temperature drop until the tank fills with hot water from the reserve. You also have to worry about eventually reselling the home. Given that, my preference is to keep it simple with a single tank. One option to give you the same effect is a single electric tank with the ...



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